﻿#define _CRT_SECURE_NO_WARNINGS 1

#include <iostream>
#include <list>

using namespace std;

//int main()
//{
//	int ar[] = { 0,1, 2, 3, 4,  5, 6, 7, 8, 9 };
//	int n = sizeof(ar) / sizeof(int);
//	list<int> mylist(ar, ar + n);
//	list<int>::iterator pos = find(mylist.begin(), mylist.end(), 5);
//
//	reverse(mylist.begin(), pos);
//	reverse(pos, mylist.end());
//
//	list<int>::const_reverse_iterator crit = mylist.crbegin();
//
//	while (crit != mylist.crend())
//	{
//		cout << *crit << " ";
//		++crit;
//	}
//	cout << endl;
//
//	return 0;
//}

//int main()
//{
//	int array[] = { 1, 2, 3, 4, 0, 5, 6, 7, 8, 9 };
//	int n = sizeof(array) / sizeof(int);
//	list<int> mylist(array, array + n);
//	auto it = mylist.begin();
//
//	while (it != mylist.end())
//	{
//
//		if (*it != 0)
//		{
//			cout << *it << " ";
//		}
//		else
//		{
//			it = mylist.erase(it);
//		}
//		++it;
//
//	}
//
//	return 0;
//}
//
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


enum Colour
{
	RED,
	BLACK
};

template<class K,class V>
struct RBTreeNode
{
	RBTreeNode<K, V>* _left;
	RBTreeNode<K, V>* _right;
	RBTreeNode<K, V>* _parent;
	pair<K, V> _kv;
	Colour _col;

	RBTreeNode(const pair<K, V>& kv)
		:_left(nullptr)
		,_right(nullptr)
		,_parent(nullptr)
		,_kv(kv)
		,_col(RED)
	{}
};

template<class K, class V>
class RBTree
{
	typedef RBTreeNode<K, V> Node;
public:
	pair<iterator, bool> Insert(const T& data)
	{
		if (_root == nullptr)
		{
			_root = new Node(data);
			_root->_col = BLACK;
			return make_pair(iterator(_root), true);
		}

		Node* parent = nullptr;
		Node* cur = _root;
		KeyOfT kot;

		while (cur)
		{
			if (kot(cur->_data) < kot(data))
			{
				parent = cur;
				cur = cur->_right;
			}
			else if (kot(cur->_data) > kot(data))
			{
				parent = cur;
				cur = cur->_left;
			}
			else
			{
				return make_pair(iterator(cur), false);
			}
		}

		// 新增节点给红色
		cur = new Node(data);
		Node* newnode = cur;
		cur->_col = RED;
		if (kot(parent->_data) < kot(data))
		{
			parent->_right = cur;
			cur->_parent = parent;
		}
		else
		{
			parent->_left = cur;
			cur->_parent = parent;
		}

		while (parent && parent->_col == RED)
		{
			Node* grandfather = parent->_parent;
			if (parent == grandfather->_left)
			{
				//     g
				//   p   u
				// c
				Node* uncle = grandfather->_right;
				if (uncle && uncle->_col == RED)
				{
					// 变色
					parent->_col = uncle->_col = BLACK;
					grandfather->_col = RED;

					// 继续往上更新处理
					cur = grandfather;
					parent = cur->_parent;
				}
				else
				{
					if (cur == parent->_left)
					{
						// 单旋
						//     g
						//   p
						// c
						RotateR(grandfather);
						parent->_col = BLACK;
						grandfather->_col = RED;
					}
					else
					{
						// 双旋
						//     g
						//   p
						//     c
						RotateL(parent);
						RotateR(grandfather);
						cur->_col = BLACK;
						grandfather->_col = RED;
					}

					break;
				}
			}
			else  // parent == grandfather->_right
			{
				//     g
				//   u   p 
				//          c
				//
				Node* uncle = grandfather->_left;
				if (uncle && uncle->_col == RED)
				{
					// 变色
					parent->_col = uncle->_col = BLACK;
					grandfather->_col = RED;

					// 继续往上处理
					cur = grandfather;
					parent = cur->_parent;
				}
				else
				{
					if (cur == parent->_right)
					{
						RotateL(grandfather);
						parent->_col = BLACK;
						grandfather->_col = RED;
					}
					else
					{
						//     g
						//   u   p 
						//     c
						//
						RotateR(parent);
						RotateL(grandfather);
						cur->_col = BLACK;
						grandfather->_col = RED;
					}

					break;
				}
			}
		}

		_root->_col = BLACK;

		return make_pair(iterator(newnode), true);
	}

	void RotateL(Node* parent)
	{
		Node* subR = parent->_right;
		Node* subRL = subR->_left;

		parent->_right = subRL;
		subR->_left = parent;

		Node* parentParent = parent->_parent;

		parent->_parent = subR;
		if (subRL)
			subRL->_parent = parent;

		if (_root == parent)
		{
			_root = subR;
			subR->_parent = nullptr;
		}
		else
		{
			if (parentParent->_left == parent)
			{
				parentParent->_left = subR;
			}
			else
			{
				parentParent->_right = subR;
			}

			subR->_parent = parentParent;
		}
	}

	void RotateR(Node* parent)
	{
		Node* subL = parent->_left;
		Node* subLR = subL->_right;

		parent->_left = subLR;
		if (subLR)
			subLR->_parent = parent;

		Node* parentParent = parent->_parent;

		subL->_right = parent;
		parent->_parent = subL;

		if (_root == parent)
		{
			_root = subL;
			subL->_parent = nullptr;
		}
		else
		{
			if (parentParent->_left == parent)
			{
				parentParent->_left = subL;
			}
			else
			{
				parentParent->_right = subL;
			}

			subL->_parent = parentParent;
		}
	}

private:
	Node* _root = nullptr;
};


